Examine source code of Lightning

{
  "manifest_version": 2,
  "name": "Lightning",
  "version": "1.0.21",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "styles/baloon.css"
      ],
      "js": [
        "includes/script.js"
      ]
    }
  ],
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "<all_urls>",
    "icons/*"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "browser_action": {
    "default_title": "Lightning",
    "default_icon": "icons/icon.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2f570992-1ebd-48b4-85db-9f55b89dcb0c}"
    }
  }
}